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One Hole in the Two-Leg t-J Ladder and Adiabatic Continuity to the Noninteracting Limit
S R White1, D J Scalapino1, S A Kivelson1
1Department of Physics, University of California, Irvine, California 92697, USA, Department of Physics, University of California, Santa Barbara, California 93106, USA, and Department of Physics, Stanford University, Stanford, California 94305, USA.
Physical Review Letters
|August 15, 2015
Summary
Density-matrix-renormalization group (DMRG) calculations reveal that charge density modulation in two-leg t-J ladders arises from quasiparticle dispersion shifts, not exotic Mott physics or charge localization.
Area of Science:
- Condensed matter physics
- Quantum magnetism
- Strongly correlated electron systems
Background:
- The two-leg t-J ladder model is a key system for studying strongly correlated electrons.
- Previous studies suggested exotic Mott physics and charge localization in this model.
- Understanding charge modulation mechanisms is crucial for condensed matter theories.
Purpose of the Study:
- To investigate the origin of charge density modulation in a two-leg t-J ladder with one doped hole.
- To re-evaluate claims of exotic Mott physics and charge localization.
- To provide an alternative explanation for observed phenomena.
Main Methods:
- Density-matrix-renormalization group (DMRG) calculations were employed.
- The study focused on the behavior of one doped hole in the two-leg t-J ladder.
- Analysis involved examining quasiparticle dispersion and charge density modulation.
Main Results:
- The study found no evidence of charge localization.
- Charge density modulation was shown to arise from shifts in the quasiparticle dispersion minimum away from π.
- Singular changes in quasiparticle dispersion were observed but explained by a noninteracting band structure perspective.
Conclusions:
- Exotic Mott physics and charge localization are not the primary drivers of charge modulation in this model.
- The observed phenomena can be understood through a simpler, noninteracting band-structure framework.
- DMRG calculations provide insights into the complex behavior of doped holes in t-J ladders.
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